Photo by Melody

PlantFiles: Locust
Robinia x ambigua 'Decaisneana'

Family: Papilionaceae (pa-pil-ee-uh-NAY-see-ee) (Info)
Genus: Robinia (roh-BIN-ee-uh) (Info)
Species: x ambigua
Cultivar: Decaisneana

One vendor has this plant for sale.


20-30 ft. (6-9 m)
30-40 ft. (9-12 m)

20-30 ft. (6-9 m)

USDA Zone 4a: to -34.4 C (-30 F)
USDA Zone 4b: to -31.6 C (-25 F)
USDA Zone 5a: to -28.8 C (-20 F)
USDA Zone 5b: to -26.1 C (-15 F)
USDA Zone 6a: to -23.3 C (-10 F)
USDA Zone 6b: to -20.5 C (-5 F)
USDA Zone 7a: to -17.7 C (0 F)
USDA Zone 7b: to -14.9 C (5 F)
USDA Zone 8a: to -12.2 C (10 F)
USDA Zone 8b: to -9.4 C (15 F)

Sun Exposure:
Full Sun

Seed is poisonous if ingested
Parts of plant are poisonous if ingested

Bloom Color:

Bloom Time:
Late Spring/Early Summer

Grown for foliage

Other details:
This plant is attractive to bees, butterflies and/or birds
Flowers are fragrant
Average Water Needs; Water regularly; do not overwater

Soil pH requirements:
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)

Patent Information:
Unknown - Tell us

Propagation Methods:
From hardwood cuttings
From seed; direct sow outdoors in fall

Seed Collecting:
Allow pods to dry on plant; break open to collect seeds
Seed does not store well; sow as soon as possible


2 positives
No neutrals
No negatives

Gardeners' Notes:

Positive meg1705 On Nov 19, 2013, meg1705 from Dunedin
New Zealand wrote:

How interesting that the previous comment is from so close by! I only managed to definitively identify the beautiful tree in my friend's garden when it flowered. We will try and propagate more. It is probably close to fully grown now but is excellent near the house - doesn't block the view of the hills behind it, is light and airy with an elegant structure, casts lovely dappled shade, hasn't suckered at all and although the branches are brittle this hasn't caused any problems so far. Another striking feature not often mentioned is its stripey grey-green and white bark.

Positive baiissatva On Jan 30, 2009, baiissatva from Dunedin
New Zealand wrote:

9b coastal Otago New Zealand

This is the Pink Wisteria Tree, it's foliage very similar to the familiar robinia pseudoacacia 'Frisia' except that it is medium green instead of golden. I think the tree is a little more gracile in form than the latter, being a bit more 'lacy' in it's layered branches and general visual delicacy.
This is a central tree in the 'arboretum' section of our half acre coastal garden and while it had a little shelter from the high prevailing winds, it's planted in rubbishy clay soil and gets zero attention, as well as having to contend with a good deal of competition from other trees. It also began life as a skanky little abused twig from the 'bargain' section of the nursery. In five years it had recovered from it's poor start and blossomed into a lovely and much admired tree, rewarding us every year with a long display of shell-pink wisteria type flowers that fill the garden with a delicate perfume in spring.
It has suckered only twice and in small numbers.
Maples and other tender underplanting species love the dappled shade this tree casts, which is perfectly adequate to permit lawn growth beneath it.
To my mind it is an uncommonly beautiful and very useful tree in any collection, having many excellent features and no drawbacks.
Trim or prune hard to your preferred form.
Highly recommended.

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